Why do I see the error "...INVALID_STATUS, invalid convertedStatus: Closed - Converted" when registering for an event?

Problem:

After registering for a Soapbox Event, you see the following error message:

sbxe1.sbx_EventsCampaignMember caused an unexpected exception, contact your administrator: sbxe1.sbx_EventsCampaignMember: execution of AfterInsert caused by: System.DmlException: ConvertLead failed. First exception on row 0; first error: INVALID_STATUS, invalid convertedStatus: Closed - Converted: []: (sbxe1)

Cause:

The issue is likely that your Salesforce instance does not have the necessary values available for the Soapbox Events Registrations Lead Processes. You can confirm this by going to Setup --> Customize --> Leads --> Lead Processes and clicking on Soapbox Events Registrations. If no values are present in the Selected Values list, Leads will not be autoconverted when they are created.

Solution:

To remedy this, add the following to the Selected Values list and click Save: 

• Open - Not Contacted
• Working - Contacted
• Closed - Converted
• Closed - Not Converted